摘要
为探究油松人工林土壤粒度特征随林龄变化的规律,揭示油松人工林对林下土壤的影响作用,为辽西北地区以油松为建群种的造林模式、土壤地力恢复及环境保护提供科学依据,以辽宁省昌图县东部太阳山风景区13、25、37和44年生的油松人工林为研究对象,采集各林龄油松林表层(0~20cm)土壤样,基于激光衍射技术,对土壤粒度,组成和特征进行分析。结果表明:(1)研究区内土壤粒度组成以沙粒为主,其次是粉粒和黏粒;(2)中龄林的粒度特征最好,其次为近熟林、成熟林,而幼龄林稍差,且有林样地的粒度特征均比对照好;(3)整体上,从幼龄林期到中龄林期,油松林随林龄的增大,表层土壤粒度特征有良好的发展趋势,而从中龄林期到近熟林、成熟林期,油松林随林龄增大表层土壤粒度特征逐渐变差。
In order to explore soil particle size characteristics of Pinus tabuliformis plantation under different forest age,imply effects of Pinus tabuliformis plantationon undergrowth soil, thus to provide scientific theoretical basis for plantations of Pinus tabuliformis in Northwestern Liaoning Province, and provide soil fertility restoration en-vironmental protection in that area. Taking 13 〉 25 〉 37 and 44-year-old Pinus tabuliformis plantation of the Taiyan- gshan scenic spot in eastern Changtu County as research objects,the surface soil samples of Pinus tabuliformis plan-tation were collected sorted by planting age and the experiments were conducted based on laser diffraction technique. The characteristics of soil particle size were analyzed. Result shows that （1） in the study area,the majority of soil particle size are occupied by sand particles, followed by silt particles and then clay particles; （2） the soil particle size characteristics of middle forest age is determined to be the optimal, followed by the near mature forest and mature forest,young forest is a bit poor. The soil particle size characteristics of forest sample plot is optimal than CK; （3） overall） the soil particle size has a good development trend with increasing age from the young forest stage to mid-dle-age forest stage. And the surface particle size was gradually become worse with increasing age from the middle- age forest stage to the nearly mature forest and mature forest stage.
出处
《防护林科技》
2017年第7期27-30,62,共5页
Protection Forest Science and Technology
关键词
林龄
油松
人工林
土壤粒度特征
分形维数
forest age
Pinus tabuliformis forest
soil particle size characteristics
fractal dimension
